SB Acoustics SB20PFCS30-7
midrange · EBP 51 → suits either box · nominal (full) — SB Acoustics datasheet (https://sbacoustics.com/wp-content/uploads/2025/03/8in-SB20PFCS30-7.pdf)
Thiele/Small parameters
| Fs (resonance) | 39 Hz |
| Qts | 0.66 |
| Qes / Qms | 0.77 / 4.5 |
| Vas | 59.5 L |
| Re / nominal Z | 5 Ω / 7 Ω |
| Xmax | — |
| Sensitivity | 88.4 dB (1 W/1 m, calc); 88 dB (2.83 V/1 m, mfr) |
| Power handling | 40 W |
Published (nominal) values, params full — verify by measurement (DATS/REW) before building.
Datasheet (PDF) ↗ — manufacturer-hosted
Recommended enclosures
This is a midrange; Thiele/Small box parameters are not used for enclosure design.
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About this driver
The SB Acoustics SB20PFCS30-7 is a midrange with a free-air resonance of 39 Hz and a total Q (Qts) of 0.66. Its efficiency-bandwidth product (EBP) of 51 points toward either alignment. See the sealed vs ported guide for how to choose.
Recommended partners
modeled estimateThese tweeters could pair with the SB Acoustics SB20PFCS30-7 in a two-way design, but the seed Thiele/Small data is too thin to grade the match yet — add or measure T/S (Fs, Sd, Xmax) to compute a real compatibility grade. You can still open a pair in the guided builder.
- Dayton Audio AMT-Mini-8Insufficient data to grade
Crossover not modelable yet — tweeter needs published Thiele/Small data.
Build this pair → - Dayton Audio AMT2-4Insufficient data to grade
Crossover not modelable yet — tweeter needs published Thiele/Small data.
Build this pair → - Dayton Audio AMT3-4Insufficient data to grade
Crossover not modelable yet — tweeter needs published Thiele/Small data.
Build this pair → - Dayton Audio AMTPOD-4Insufficient data to grade
Crossover not modelable yet — tweeter needs published Thiele/Small data.
Build this pair → - Dayton Audio AMTPRO-4Insufficient data to grade
Crossover not modelable yet — tweeter needs published Thiele/Small data.
Build this pair → - Dayton Audio AN25F-4Insufficient data to grade
Crossover not modelable yet — tweeter needs published Thiele/Small data.
Build this pair →
Modeled estimate from T/S + geometry — no measurements. The verdict is robust; it improves with measured FRD/ZMA data.